Abrading tool



Oct. 28, 1947. P. J. GREULACH ABRADING TOOL Filed Feb. 20, 194.6 2 Sheets$heet 1 Inventor fa zaZJrea 24m,

Zmwiiu Oct. 28, 1947. P. J. GRVEULACH ABRADING TOOL Filed Feb. 20, 1946 2 Sheets-Sheet 2 Q ms b n/enter fazaZJ 17: uZack Patented Oct. 28, 1947 ABRADING TOOL Paul J. Greulach, Fort Wayne, Ind., assignor of one-half to William E. Platt, Fort Wayne, Ind.

Application February 20, 1946, Serial No. 648,841

7 Claims.

This invention relates to new and useful improvements and structural refinements in abrading machines, more particularly, to a machine such as may be employed for the sanding, dressing, surfacing, or refinishing of floors and the like.

The principal object of the invention is to provide a device of the character herein described in which a unique structure is employed for the mounting of the abrasive medium upon the drum and in which novel means is incorporated for the mounting of the drum itself.

By virtue of the above outlined construction, the span of life of the abrasive medium is considerably lengthened and when the same becomes excessively worn, the replacement thereof may be easily and conveniently effected.

A further advantage resulting from the novel construction of the machine resides in the manner in which the same is used, it being possible to bring the machine within very close limits to the junction of the floor with a wall, so that subsequent edging operation such as was conventionally required, is no longer necessary.

A further object of the invention is to provide such abrading machine with self-contained means for collecting dust and the like, resulting from the abrading operation,

An additional object of the invention is to provide an abrading machine which is pleasing in appearance and which will surpass the general utility and efllciency of machines conventionally employed for the purpose to which it appertains.

With the above more important objects in view, and such other objects as may become apparent as this specification proceeds, the invention consists essentially of the arrangement and construction of parts as illustrated in the accompanying drawings, in which:

Figure 1 is a side elevation of the invention, with the removable cover on the housing thereof in the open position to reveal the construction of the abrading drum.

Figure 2 is a cross-sectional View, taken approximately in the plane of the line 2-22-2 in Figure 1.

Figure 3 is a top plan view of a sleeve used in the invention, and

Figure 4 is an end view, partially broken away, of the same.

Like characters of reference are used to designate like parts in the specification and throughout the several views.

Referring now to the accompanying drawings in detail, the invention consists of a housing 10,

configurated substantially as shown and provided in the bottom thereof with a mounting plate H, on which an electric motor l2 may be conveniently secured.

The housing is also provided with a pivoted handle [3 and with a plurality of wheels l4, whereby the machine as a whole may be conveniently pushed or pulled along the floor IS.

A stationary spindle I6 is formed at one of its ends with a mounting flange l1 and a plurality of bolts [8 are used to secure the flange and the associated spindle to the side IQ of the housing It].

The spindle I6 is provided with a pair of antifriction bearings such as the ball bearings 20, the latter in turn, being positioned in an axial bore 2| formed in one end of the abrading drum 22. In this manner, the drum is rotatably mounted on the spindle I 6 and it will be noted that the remaining end of the drum is formed with a frusto-conical recess 23 in communication with the bore 2|. 2 l

The remaining end of the spindle I6 is provided with a screw-threaded portion 24 adapted to receive the nut 25, whereby the drum 22 is retained on the spindle.

Defining the outer surface of the drum 22 is a tapered lateral wall 26, and an expansible sleeve 21 provided with a co-acting, tapered inner wall 28 is removably positioned on the drum, as will be clearly apparent from the accompanying drawings.

The sleeve 21 is formed with a plurality of longitudinally extending slots 29, the same being open alternately at the opposite ends of the sleeve, as is best illustrated in the accompanying Figure 3. A tubular abrasive covering such as may assume the form of a continuous sand paper jacket 30, is removably positioned on the sleeve 21 to provide the abrading surface.

A circular anchor plate 3| is secured in the recess 23 of the drum 22, the plate being formed with a screw-threaded aperture 32, concentric with the bore 2 I. A frusto-conical pressure plate 33 is formed at the minor end thereof with the end wall 34, the latter in turn, being formed with a central aperture 35. r

The shank of an adjusting screw 36 engages the aperture 32 of the plate 3!, and the screw 36 is also provided with a shoulder 31 formed with an annular groove 38. The edges of the aperture 35 engage the groove 38, as will be clearly apparent from the accompanyin Figure 2, and it should be understood that to facilitate construction, the shoulder 31 may assume the form of an annular ring and that a separate collar 39 may be positioned on the shank of the screw 36 to cooperate with the ring 31 in the formation of the groove 38.

The remaining, that is the major end of the pressure plate 33 carries an out-turned flange 46 and a plurality of off-set brackets 4| are bolted to this flange by means of the bolts 42.

This flange together with the brackets, constitutes means for connecting the pressure plate 33 to the major end of the sleeve 21, the latter being provided for this purpose, with a plurality of inwardly projecting lugs 43. These lugs .are receivable between the flange 40 and the brackets 4| and it will be apparent that by loosening the bolts 42 and turnin the brackets 41 out of engagement with the lugs 43, the plate 33 may be detached from the sleeve 21.

To facilitate installation and removal 'of'th'e sleeve 21 and the associated covering 36, the housing 10 is provided with a substantially cir- =cular opening 44, normally closed by ahinged cover 45. The latter is pivotally attached to the housing by means of the bolt or rivet 46 and is also provided with a hook-like catch 41. When the cover is in the closed position, the catch 4'! engages a securing bolt 48.

Extending transversely across the full Width of the drum 22 is a dust pick-up scoop 49, the mouth 50 of the latter being disposed adjacent to the periphery of the drum and slightly above and behind the line of contact of the drum with the floor [5.

The scoop 48 is connected by means of the duct to the inlet of a scroll casing 52, conventional blower fan 53 i rotatable in this casing, being positioned on the armature shaft of the aforementioned motor l2. The outlet; 54 of the casing 52 protrudes out of the housing H] and a conventional dust collecting receptacle (not shown) may be connected thereto, to accommodate the accumulating dust.

The major end of the drum 22 is formed integrally "with a grooved pulley 55, the same in effect, assuming the form-of a simple groove provided in the outer wall of the drum. A relatively smaller pulley 56 is positioned on the armature shaft of the motor l2 and an endless belt 51 connects the two pulleys to effect the rotation of the drum.

Having thus described the construction of the invention, its method of operation will now be presented.

In operation, the machine is used in the conventional manner by being pushed or pulled along the floor l5 while the rotating drum 22 provided with the abrasive covering 30 contacts the floor. Simultaneously, the associated fan 53 will draw the dust through the scoop 49 nd discharge the same through the duct 54, thereby eliminating the conventionally experienced, undesirable dissipation of dust particles while the machine is in operation.

all subsequent "edging operations.

The essence of the invention further resides in the novel manner in which the abrasive covering 7'5 4 30 is positioned on the drum, the same being presently described.

Assuming the device to be in the position indicated in Figure 2, by rotating the screw 36, the sleeve 2'! together with the covering 38 will be drawn from the tapered surface 26 of the drum 22. The presence of the slots 29 provide for inherent resiliency in the sleeve 2'! so that as the sleeve is removed from the drum, the same (the sleeve) Will contract so that the covering 33 may be easily removed therefrom.

After the covering has been replaced, the sleeve is again positioned on the drum and by tightening the screw 36, the co-acting tapered surfaces 26 and .28 will uniformly expand the sleeve 21, so that the covering 39 will be firmly and securely retained thereon.

The depth of cut, so to speak, of the abrading drum on the floor may be varied by exerting upward or downward pressure upon the handle it, the wheels l4 acting as pivots for the housing I ii.

The advantage of -the continuous surface of the abrasive covering 36 can be readily appreciated, since the same entirely eliminates the flat spot on the drum where the ends of a conventional abrasive strip are secured thereto.

While in the foregoing there has been shown and described the preferred embodiment of this invention it is to .be understood that minor changes in the details of construction, combination and arrangement of parts may be resorted to without departing from the spirit and scope of the invention as claimed.

What I claim as my invention is:

1. An abradi-ng drum structure comprising in combination, a drum formed with an axial bore and having a tapered lateral wall defining the outer surface thereof, a stationary spindle in one end of said bore, anti-friction bearings on said spindle, said drum being rotatable on said bearings, an expansible sleeve provided with a co-acting, tapered inner wall, tubular abrasive covering removably positioned on the outer lateral wall of said sleeve, said sleeve being removably positioned on said drum, and means in the remaining end of said bore for applying and removing said sleeve.

2. The device as defined in claim 1 in which said sleeve is formed with a plurality of longitudinally extending slots, each of said slots being open at one of its ends.

3. The device as defined in claim 1 together with a grooved drive pulley formed integrally at one end of said drum.

4. The device as defined in claim 1, in which said means comprises in combination, an anchor plate in said bore, an adjusting screw co-axial with said bore and threaded into-said plate, said screw being formed with an annular groove, a pressure plate formed with a central aperture and connected to said sleeve, the edge of said aperture engaging said groove.

5. A drum structure for abrading machines comprising in combination, a drum formed with an axial bore in one endthereof and with a frosteconical recess in its remaining end, said recess constituting a continuation of said bore, said of said pressure plate, an out-turned flange at the major end of said pressure plate, a screwthreaded adjusting bolt engaging said aperture in said anchor plate, a shoulder medially the length of said bolt and an annular groove in said shoulder, the edge of said aperture in the end wall of said pressure plate rotatably engaging said groove, an expansion sleeve provided with a co-acting, tapered inner wall and with a plurality of longitudinally extending slots, said slots being open alternately at the opposite ends of said sleeve, a tubular abrasive covering remov ably positioned on said sleeve, and separable means for attaching the major end of said sleeve to said flange.

6. The device as defined in claim 5, in which said means comprises in combination, a plurality of inwardly projecting lugs on the inner wall of said sleeve, a plurality of off-set brackets bolted to said flange, said lugs being receivable between said flange and said brackets.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,068,347 Myers June 19, 1937 1,708,603 Brown Apr. 9, 1929 

